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Chlorine photosynthesis on exoplanets
I can think of one possible reason why chlorine-based ecosystems might be rare. It's simply that chlorine is much rarer than oxygen. In addition, it isn't immediately obvious what such an ecosystem might use as a working solvent; polar chlorine compounds aren't all that common and their interaction with the far more common water might be a problem.

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RE: Chlorine photosynthesis on exoplanets - by iancampbell - 03-26-2013, 06:29 AM

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